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Molybdophyllite Mineral Data

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General Molybdophyllite Information

Help on Chemical  Formula: Chemical Formula: Pb9Mg9Si9O24(OH)24
Help on Composition: Composition: Molecular Weight = 3,128.48 gm
   Magnesium   6.99 %  Mg   11.59 % MgO
   Silicon     8.08 %  Si   17.29 % SiO2
   Hydrogen    0.77 %  H     6.91 % H2O
   Lead       59.61 %  Pb   64.21 % PbO
   Oxygen     24.55 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb9Mg9Si9O24(OH)24
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1901
Help on Locality: Locality: Langbanshyttan, Vermland. Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for "lead" and "leaf", in allusion to its composition and foliated habit.
Help on Name Pronunciation: Name Pronunciation: Molybdophyllite + Pronunciation Say MOLYBDOPHYLLITE

Molybdophyllite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.92818
Help on Cell Dimensions: Cell Dimensions: a = 9.371, c = 27.44, Z = 2; V = 2,086.83 Den(Calc)= 4.98
Help on Crystal System: Crystal System: Hexagonal - Trapezohedral H-M Symbol (6 2 2) Space Group: P 6322
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 13.8(1), 4.6(0.9), 2.67(0.7),

Physical Properties of Molybdophyllite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Colorless, Pale green, Pale yellow.
Help on Density: Density: 4.7
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Molybdophyllite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.058 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1582,KPDmeas= 0.1677,KC= 0.168
Ncalc = 1.79 - 1.84
Help on Optical Data: Optical Data: Uniaxial (-), e=1.761, w=1.815, bire=0.0540.

Calculated Properties of Molybdophyllite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.15 gm/cc
note: Specific Gravity of Molybdophyllite =4.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PEMolybdophyllite =1,037.74 barns/electron
U=PEMolybdophyllite x rElectron Density=4,302.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Molybdophyllite is Not Radioactive

Molybdophyllite Classification

Help on  Dana Class: Dana Class: (78)Unclassified silicates
  (78.05)possible phyllosilicates
  (78.05.07)Dana Group Molybdophyllite Pb9Mg9Si9O24(OH)24 P 6322 6 2 2
Help on  Strunz Class: Strunz Class: 09.HH.25 09 - SILICATES (Germanates)
  09.H - Unclassified Silicates
  09.HH -With Pb
09.HH.25 Molybdophyllite Pb9Mg9Si9O24(OH)24 P 6322 6 2 2

Other Molybdophyllite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Molybdophyllite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 09.HH.25





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